File



June 7 1927.

M. E. NORDAN FILE Filed Feb.

. skidding oil of the points during the filing ing and spacing of the electrodes of spark plugs.

Patented June 7, 1927.

UNITED STATES MiON'lE E; NORDAN, OF WEST FRANKFORT, ILLINOIS.

FILE.

Applicationfiled February 11. 1926. Serial 86.87345.

The present invention relates to files, and the primary object of the invention is to provide a novel type of file particularly well adapted for-filing or cleaning of breaker points of spark coil units.

A further object of the invention is to provide a file embodyingnovel features of construction whereby the breaker points of spark coi] units may be filed simultaneouslv without liability of the file slipping or operation, thus allowing for the points to be cleaned in an eflicient and fascile manner without relying wholly to ones sight or feeling as .to whether the file is properly positioned between the breaker points.

A further object of the invention is to provide animproved type of file which aside from the aforementioned features will be found to be particularly useful .in the clean- Other objects and advantages of the invention will be apparent during the course of the following detail description, "taken in connection with the accompanying drawing forming a part of this specification and in which drawing:

Figure 1 is a plan view of one face of the improved file.

Figure 2 is a central longitudinal section through the file.

Fi re 3 is a transverse section through the lo and showing the same in operative osition for simultaneous cleaning of two reaker points of a spark coil unit.

Figure 4 is a plan view of the reversed side of the file from that shown in Figure 1 and showing the same in use for cleaning a breaker point.

Figures 5 and 6 are views showing the improved file in use for cleaning the electrodes of two different ty es of spark plugs.

In the drawing, and w erein similar reference characters designate correspondin parts throughout the several views, the file A which is of a type commonly known as a flat file, embodies a main body portion 10 which. preferably has the handle portion 11 formed integral therewith and extending in longitudinal alignment with the main body portion. The main body portion 10 which is of equal thickness throughout its length, and has its edges extending in parallel relation to one another, in the exam le shown, has its opposite faces provided with double cuts for providing cutting surfaces 12 and 13 which extend from edge to edge of the body portion and substantially throughout the entire length thereof. The forward end of the body portion 10 may have its opposite faces bevelled as at 14 for permitting of the forward end of the file being readily passed between the elements to be abraded by the file.

Extending along each marginal edge of the body portion 10 are flanges 15 having one edge lying substantially flush with the cutting surface 12, and having their opposite edges extending'past the cutting surface 13 and forming retaining flanges at each longitudinal edge of the cutting surface 13. These flanges 15 which extend throughout the length of the body portion 10, and which extend at right angles to the cuttmg faces of the body portion, have their inner or confronting surfaces 16 plain so that when in use, no cutting will occur at the side edges of the coil points or electrodes being cleaned by the file. It is preferred that these flanges 15 be welded or other wise secured to the side edges of the body portion after the cutting or roughening of the faces of the file in order that the. files may be produced in the usual manner by cutting machines now in use. It will of course be understood that these flanges may be formed integral with the body portion, but it is preferred that the flanges be secured to the body portion after cutting of the file, in order that the faces of the file will present cutting surfaces throughout their entire width. It may also be possible to roughen the cutting surfaces of the file and then bend the flanges at each ed e of the body portion.

it will be seen that upon reversing of the file that the point 20 may be further out or filed by the cutting surface 12 which extends substantially flush with the lower edges of the flanges. It will be seen that in either position of the file, that the flanges 15 will engage the sides of either the point 20 or the point 22 and prevent the file from slipping from between the points. In Figures 5 an 6, and wherein the file is shown in use for cleaning the electrodes'of spark plugs, it will be seen that the flanges 15 will prevent the file from slipping or skidding from the respective electrodes 25, and that the thickness of the file may act as a gauge for proper spacing of the electrodes 25 from their companion electrodes 26.

From the foregoing description it will be apparent that a novel type of file has been provided particularly well adapted for the cleaning of breaker points of coil units and the electrodes of spark plugs, without liability of the file slipping or skidding from the point or electrode when being used, and which file is of such construction as to permit of one cutting face of the file being used for cutting the member being filed to any desired amount.

Changes in detail may be made to the form of the invention herein shown and described, Without departing from the spirit of the invention or the scope of the following claims.

I claim:

1. A flat file embodying a main body portion having exposed cutting surfaces provided at each face thereof for simultaneous abraiding of two confronting surfaces, and

plain surfaced flanges extending along each edge of the body portion and pro'ecting beyond the plane 0 only one of t e cutting surfaces.

2. A flat file embodying a main body port1on having cutting surfaces provided on each face thereof, and strips welded to each edge of the body portion as an integral part thereof, and formin retaining flanges at each longitudinal e ge of the main body portion.

3. A file embodying a main body port-ion having cutting surfaces provided at each face thereof, and strips welded to each longitudinal edge of the body portion as an integral part thereof and having one ed e disposed in a plane beyond the plane of on y one of the cutting surfaces.

4. A file embodying a main body portion having cutting surfaces provided at each face thereof, and plain surfaced strips welded to each longitudinal edge of the body portion, said strips being disposed with one edge located at a point between the planes of the opposed cutting surfaces, and having their opposite edges disposed outwardly of the plane of one of the cutting surfaces and providing integral retaining flanges having plain confronting faces at each longitudinal edge of the body portion to one side of the file only.

' MONTE E. NORDAN- 

